Halekiʻi-Pihana Heiau State Monument is a 10-acre (4.0 ha) park containing two important luakini heiau on a high ridge near the mouth of ʻIao Stream in Wailuku, Maui. Both Halekiʻi and Pihana were associated with important Hawaiian chiefs, have been closely studied by archaeologists, and overlook the fertile Nā Wai ʻEhā ('Four Waters') region irrigated by the Wailuku, Waikapu, Waiheʻe and Waiehu streams. The heiau complex was added to the National Register of Historic Places on 25 November 1985.